[PATCH] power: Fix VSCR position on ucontext

[Rogerio Alves]

Hi everyone,

Here is patch v3 with the suggestions given. Sorry for take me that long 
to reply. Thanks for the review

Regards

Em 16-11-2018 11:18, Gabriel F. T. Gomes escreveu:
> On Wed, 14 Nov 2018, Florian Weimer wrote:
> 
>> * Rogerio Alves:
>>
>>> +#ifdef _ARCH_PWR8
>>
>> Is it possible to perform run-time detection instead?

Now I am using auxval to get if the arch is supported for the test
> 
> That's a fair point.  Even though we have bots that test powerpc64
> (big-endian) builds configured with `--with-cpu=power8', that's not the
> default.  Runtime detection could make this test work on default builds
> (provided they are run on a POWER8 machine).
> 
>> +  /* Set SAT bit in VSCR register.  */
>> +  asm volatile ("vspltisb %0,0\n"
>> +                "vspltisb %1,-1\n"
>> +                "vpkudus %0,%0,%1\n"
> 
> Also, if you replace `vpkudus' (only available since Power ISA 2.07) with
> `vpkuwus' (available since PowerISA 2.03) the test remains valid and it
> could be tested on older machines.
> 

Done
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